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Ni(OH)2/NiFe-PBA heterostructure nanoarrays with a surface-reconstructed Cl- repelling layer for efficient and stable
Wenjie Shi1, Yanyan Song2, Qingyu Li1
1College of Chemistry and Chemical Engineering, Collaborative Innovation Center for Hydrogen Energy Key Materials and Technologies of Shandong Province, Qingdao University, Qingdao 266071, P. R. China. xyzhang@qdu.edu.cn.
Abstract:
A Ni(OH)2/NiFe-PBA heterostructure nanoarray catalyst was designed as an efficient oxygen evolution reaction (OER) electrocatalyst for alkaline seawater electrolysis, achieving a current density of 10 mA cm-2 at an overpotential of 292 mV. Notably, the Ni(OH)2/NiFe-PBA catalyst undergoes in situ reconstruction during the OER, generating NiOOH as the active site and Fe(CN)63- species as the Cl- repelling layer, suppressing chloride oxidation and improving stability. This synergistic mechanism enhances catalytic stability, enabling sustainable operation for 1000 hours at 500 mA cm-2, offering a viable strategy for hydrogen production from seawater.
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